class X{

	Y y=new Y();
	{}

	public X(){
		System.out.print("X");
	}
}
class Y{

	public Y(){
		System.out.print("Y");
	}

}
public class Z extends X{

	Y y=new Y();

	public Z(){
		System.out.print("Z");
	}
	public static void main(String[] args) {
		new Z();
	}
}